With a parallel hybrid hydraulic system, the conventional vehicle powertrain is supplemented by the addition of the hybrid hydraulic system. The hybrid hydraulic system is best suited for vehicles that operate in high stop-and-go duty cycles, including refuse where fuel economy improvements between 20 and 30 percent are typical. The Eaton Hydraulic Launch Assist™ (HLA®) System utilizes regenerative braking and is ideal in refuse truck applications.